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MathGroup Archive 2004

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Re: Transpose matrix does not work when MatrixForm is used, why?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg45599] Re: Transpose matrix does not work when MatrixForm is used, why?
  • From: drbob at bigfoot.com (Bobby R. Treat)
  • Date: Fri, 16 Jan 2004 06:05:16 -0500 (EST)
  • References: <bu0cdt$agi$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

I doubt that most of us want ALL rectangular lists displayed as matrices.

I certainly don't.

Bobby

Paul Abbott <paul at physics.uwa.edu.au> wrote in message news:<bu0cdt$agi$1 at smc.vnet.net>...
> In article <bsoe80$en3$1 at smc.vnet.net>, Dr Bob <drbob at bigfoot.com> 
> wrote:
> 
> > No, Andrzej's solution works much better. That way I get to see m in 
> > MatrixForm every time it is displayed... and still do math with it.
> > 
> > Unprotect[MatrixForm];
> > MatrixForm /:
> >    (f_)[MatrixForm[expr_,
> >       opts___]] := MatrixForm[
> >      f[expr], opts]
> > Protect[MatrixForm];
> > m = MatrixForm[{{1, 2, 3},
> >      {4, 6, 5}, {9, 8, 7}}]
> > m
> > Transpose[m]
> > Inverse[m]
> > 
> > His solution isn't complete, as this doesn't work yet:
> > 
> > m.Inverse[m]
> > 
> > This takes care of that:
> > 
> > Unprotect[MatrixForm];
> > MatrixForm /: f_[MatrixForm[a_], MatrixForm[b_]] := MatrixForm[f[a, b]]
> > Protect[MatrixForm];
> > 
> > But then this still doesn't work:
> > 
> > m.m.m
> > 
> > But this does:
> > 
> > (m.m).m
> > 
> > The behavior I want is nothing more than what Help says is already there 
> > -- MatrixForm shouldn't affect evaluation.
> 
> If you set your set your Default Output FormType to TraditionalForm then 
> matrices are automatically displayed as such and everything works as you 
> require. If you don't want to do this, you can just set things up so 
> matrices are displayed in TraditionalForm as follows.
> 
>   $PrePrint := If[MatrixQ[#] == True, TraditionalForm[#], #] & 
> 
> Earlier you wrote that
> 
> > > I don't want to see EVERY matrix in MatrixForm -- it takes up too much
> > > space on my screen, especially for a large matrix, where the screen isn't
> > > even wide enough to see a row in that format.
> 
> You may find MatrixPlot in LinearAlgebra` useful here.
> 
> Cheers,
> Paul


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